Create and submit merchant application. Initial status of application is "UW Level 1"

The POST /api/v2/banking/submit API method allows users to create and submit a merchant services application in the ISO merchant boarding system. This endpoint collects merchant-related data, including business and banking details, and submits the application for processing. Proper authentication is required, and the request body must include the necessary merchant information. Upon submission, the system returns a response indicating the status of the application, including success, failure, or errors encountered during validation.